Is your solution broken for the cases where keywords are prefixes or suffixes of each other? This situation is very common in my use-case. Also, does your solut

Is your solution broken for the cases where keywords are prefixes or suffixes of each other? This situation is very common in my use-case. Also, does your solution work if a keyword appears multiple times? I get what you're saying, but it's not quite as easy as you imply. Pulling in an entire programming language is a much bigger dependency and maintenance cost than spending a couple hours writing an algorithm. It would make more sense to just use a C extension. I did try PHP's regex. It was much, much slower.